Is it possible to refresh the Google Workspace Add-on sidebar card from installable trigger function?

Question

I have a Google Workspace Add-on, I want to update the sidebar card everytime there's a new sheet. Below is my code:

function onHomepage() {
  createOnChangeTrigger();

  return greetCard('hello');        
}

function createOnChangeTrigger() {
  const triggers = ScriptApp.getUserTriggers(SpreadsheetApp.getActiveSpreadsheet());

  if (triggers.length > 0) {
    return;
  }

  ScriptApp.newTrigger('myOnChange')
    .forSpreadsheet(SpreadsheetApp.getActive())
    .onChange()
    .create();
}

function myOnChange() {
  const card = greetCard('hi');
  
  const newcard = CardService.newNavigation()
    .popToRoot()
    .pushCard(card);

  return CardService.newActionResponseBuilder()
    .setNavigation(newcard)
    .build();
}

function greetCard(text) {
  Logger.log('greet: %s', text)

  let content = CardService.newDecoratedText().setText(text);
  let section = CardService.newCardSection().addWidget(content);

  return CardService.newCardBuilder()
      .addSection(section)
      .build();
}

Answer 1

I conclude that this isn't possible because the trigger functions are invoked from the server.